panic: kernel diagnostic assertion "bp->b_data != NULL" failed: file "/syzkaller/managers/main/kernel/sys/kern/vfs_biomem.c", line 235
Starting stack trace...
panic(ffffffff83411bbb) at panic+0x1ba sys/kern/subr_prf.c:229
__assert(ffffffff83451606,ffffffff8340a732,eb,ffffffff834271d3) at __assert+0x29 sys/kern/subr_prf.c:-1
buf_unmap(fffffd80730ae9f8) at buf_unmap+0x20a
buf_map(fffffd806ea94030) at buf_map+0x241 sys/kern/vfs_biomem.c:117
buf_get(fffffd8070fabb40,11,4000) at buf_get+0x5be sys/kern/vfs_bio.c:1163
getblk(fffffd8070fabb40,11,4000,0,ffffffffffffffff) at getblk+0x146 sys/kern/vfs_bio.c:-1
ffs2_balloc(fffffd806d433900,44000,4000,fffffd8007ffd750,2,ffff80002f0d18c8) at ffs2_balloc+0x1778 sys/ufs/ffs/ffs_balloc.c:-1
ffs_write(ffff80002f0d1950) at ffs_write+0x4f9 sys/ufs/ffs/ffs_vnops.c:345
VOP_WRITE(fffffd8070fabb40,ffff80002f0d1b08,7,fffffd8007ffd750) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245
vn_write(fffffd80715d3f10,ffff80002f0d1b08,0) at vn_write+0x1c2 sys/kern/vfs_vnops.c:408
dofilewritev(ffff80002a798540,5,ffff80002f0d1b08,0,ffff80002f0d1bb0) at dofilewritev+0x2bd sys/kern/sys_generic.c:384
sys_write(ffff80002a798540,ffff80002f0d1c60,ffff80002f0d1bb0) at sys_write+0xa2 sys/kern/sys_generic.c:300
syscall(ffff80002f0d1c60) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80002f0d1c60) at syscall+0x962 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xba2aeaf8ca0, count: 243
End of stack trace.